There will never be a switch for LBZ/LMM because there is no spare PIN available on the ECM.
In terms of a switchable tune OS for LBZ/LMM, Ross spent quite a lot of time trying to figure out how to do it. Unfortunately he hasn't made any progress. He hasn't given up, but has many other projects that he can deliver results on that will benefit customers so this has been put on hold. He looks at it periodically and we still beleive that it can be done - just not in the timeframe we'd all like
Cheers
Cindy